EE221 Lect 2 Ver1
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Transcript of EE221 Lect 2 Ver1
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8/2/2019 EE221 Lect 2 Ver1
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1
EE221 Electronics -II
Lecture 2
EE221 Spring 2012
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EE-221 ELECTRONICS -II
EE221 Spring 20122
Acknowledgement: The author of these slides acknowledges thatmost of the slides used in this course have been taken from thecourse material provided in the CD accompanying the two text booksmentioned below. Some of the slides have been modified and some
new slides have been added. The author would like to appreciateand give full credit to the efforts of the original creator of the slidesand would categorically mention that the material used ispurely for academic purpose and not whatsoever forcommercial use.
No commercial use of these slides is either intended and allthose accessing this material are advised to use this materialonly for academic non-commercial purpose. Microelectronic Circuits Sixth Edition, by Sedra, Smith Oxford University Press
Fundamentals of Microelectronics, by Behzad Razavi, John Wiley & Sons Inc
Modified by Assistant Professor Saleem Iftekhar, SEECS NUST
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RECALL: Increasing Gain of the Basic Cell
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The Cascode Amplifier
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Recall CG Configuration
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Recall CG Amplifier
m
m
vgg
vi ==1
DnodeAt
iiiiii xrorox =+= or
mxro
vgii +=
vrivvv ororox +=+=
SxomSxxx RirgRiiv++=
)(
[ ]Smooxx Rgrriv )1( ++=
Smooout RgrrR )1( ++=
x
xout
i
vR =
+ =
_
+
_
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The Cascode Amplifier
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The Cascode Amplifier
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AnodeAt
2
2
1
2
221 o
gs
o
gsgsmimr
v
r
vvgvg ++=
++=
21
221
1
1
oo
mgsim
rr
gvvg
>> )1(),1(Since212 oom rrg 221 gsmim vgvg
The Cascode Amplifier
0=
=ov
i
om
v
iG
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BnodeAt
2
2
22
o
gs
gsmor
vvgi +=
+=
2
22
1
o
mgsor
gvi
>> )1(Since 22 om rg imgsmo vgvgi 122
The Cascode Amplifier
11 mmimo gGandvgiTherefore
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0with/ == ixxout vivR
= =
The Cascode Amplifier
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oxgs riv = 2
0with/ == ixxout vivR
+
_
22 gsorogsrox vrivvv ==
22 gsmxro vgii =
122)( oxogsmxx rirvgiv +=
)(12221 oomooxx rrgrriv ++=
12221 oomooout rrgrrR ++=
>> ,Since 21122 oooom rrrrg 122 oomout rrgR
The Cascode Amplifier
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1oout rR =
11 omvo rgA =
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122)( oomout rrgR
outm
i
ovo Rg
v
vA 1==
)( 2211 omomvo rgrgA
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)( 2211 omomvo rgrgA
21212 andif)( oommomvo rrggrgA ==
)(2
ovo AA
The Cascode Amplifier
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)( 31 ooutmi
ov rRg
v
vA ==
vvooutooomm AARKrrrVmAgg and,Find200and/63.0If 32121 =====
122 )( oomout rrgR
The Cascode Amplifier
(with Resistance of Current Source)
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)(1 oponmi
ov RRg
v
vA ==
identicalarerstransistoallIf
[ ] [ ] 22 2
1
2
1oomv ArgA =
[ ][ ]{ })()( 403310221 omommv rrgrrggA
The Cascode Amp with Cascode CCS
